JP2590809B2 - Channel connection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel for allocating a channel between a master station and a plurality of slave stations distributed within a predetermined area in multiplex wireless communication. It relates to a connection device.

[Conventional technology]

There are various types of channel connection methods adopted by this type of channel connection device. Among the multiplexed radio communications, there is a conventional example in which digital transmission using time division multiplexing adopts a random request method [Ref .: "A random request demand assigned multiple access protocol for four-point-to-multipoint radio systems (A RANDOM-REQU
EST DEMAND-ASSIGNED MULTIPLE ACCESS PROTOCOL FOR
POINT-TO-MULTIPOINT RADIO SYSTEMS) "ICC 85 198
5 23.4.1-23.4.5 (pages 744-748)]. The conventional random request method employs a method of allocating a channel to a slave station whose connection request reaches the master station first.

[Problems to be solved by the invention]

In this method, a problem arises when the propagation time to the master station differs by one frame or more among a plurality of slave stations. 4th
FIG. 1 shows a conventional connection procedure between a master station and a slave station. A signal 2001 including designated channel information for connection is transmitted from the master station to each slave station. The slave stations 1 and 2 indicate stations whose propagation times are different by one frame or more. When the slave stations 1 and 2 send connection request signals 2002 and 2003 to the channels specified by the signal 2001 received from the master station, respectively, the slave station 1 and slave station 2 transmit the connection request signal 2002 and arrive at the master station at least one frame later. After a time, a connection request signal 2003 arrives. The master station allocates a channel to the connection request signal 2002 arriving earlier, and transmits a connection request prohibition command 2004 at the same time. Connection request signal 2003
The slave station 2 that has not been able to be connected receives the signal 2005 including the designated channel information for the next connection, and sends out the connection request signal 2006 again.

In this method, although the same signal 2001 is received from the master station, and the slave stations 1 and 2 transmit the connection request signal,
Since the propagation times of the radio waves are different, the connection request signal of the slave station 1 arrives at the master station earlier, and there is a disadvantage that the slave stations 1 and 2 have a practical priority.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a channel connection device that allows each slave station to make a fair connection when a channel is connected between each master station and each slave station in a multiplex wireless communication system.

[Means for solving the problem]

The present invention provides a channel connection device in a wireless system in which a master station receives connection request signals from a plurality of slave stations and instructs a line setting, and a line designation device for transmitting a line designation signal indicating an available line. For each of the line designation signals, a timer device that measures a predetermined time, and the timer device selects any one of the connection request signals received by the master station within the predetermined time, and A plurality of selection devices that notify the selection to the plurality of slave stations; and an idle line change device that changes the available line to another idle line other than the one used by the selection device. Features.

[Action]

FIG. 1 shows the principle of the present invention, and FIG. 2 shows the channel connection procedure.

In FIG. 1, reference numeral 10 denotes a line designation device, reference numeral 20 denotes a timer device, reference numerals 30, 31, and 32 denote selection devices, and reference numeral 40 denotes an idle line change device.

In FIG. 2, slave station 1 is the station with the shortest propagation time from the master station in the system, and slave station 3 is the station with the longest propagation time. From the master station, a line designation signal 1001 including the designated channel # 1 information for connection is transmitted from the line designation device 10 to a plurality of slave stations. It is assumed that the mobile station 1 and the mobile station 3 have different radio wave propagation times to the master station by one frame or more. The slave stations 1 and 3 send connection request signals 1010 and 1020 to the channel # 1 designated by the line designation signal 1001 received from the master station, respectively. On the other hand, in the master station, the timer device 20 starts operating at the moment when the line designation signal 1001 is transmitted. This timer device 20 operates for a sufficient time T until the master station sends out a signal including the designated channel information for connection and the connection request signal 1020 is returned from the slave station 3 having the longest propagation time. And During this timer operation, the selection device 30 arbitrarily selects from the connection request signals whose reception has been confirmed,
This is notified to each slave station by a signal 1005. During this timer operation, in order for the master station to accept connection requests from slave stations other than slave station 1 and slave station 3, the connection lines are changed one after another by the idle line changing device 40, and the contents are designated as lines. It is transmitted from the device 10 to each slave station. In FIG. 2, channel # 2 is designated by line designation signal 1002, and channel # 3 is designated by line designation signal 1003.
And channel # 4 is designated by the line designation signal 1004. The timer device 20 performs an operation for a plurality of T times in response to each transmission of the line designation signal. In FIG. 1 and FIG. 2, the selection device 30 responds to the line designation signal 1001.
However, the selection device 31 corresponds to the line designation signal 1002, and the selection device 32 corresponds to the line designation signal 1003. Signal 1004
, Since the selection device 30 has completed the selection of the T time, it newly acts as a selection device for channel # 4.

Since each selecting device is configured to select an arbitrary station from all the connection request signals received by the master station, it is possible to treat each slave station fairly irrespective of a difference in propagation time. .

〔Example〕

FIG. 3 is a diagram showing a channel connection procedure according to one embodiment of the present invention. In the figure, it is assumed that a slave station 3 is a slave station having the longest propagation time and has a delay of two frames in a round trip. or,
The line designation signal changes its channel every frame,
Shall be sent. Signals 3001, 3002, 3003, 3004, and 3005 are signals including line designations corresponding to channels # 1, # 2, # 3, # 4, and # 3, respectively. Further, signals 3004 and 3005 also include information for notifying the slave station that the connection request signal from the slave station has been selected by the selection device. Further, the timer operation time T is equal to two frames, and the line designation signal transmitted during the timer operation is two channels. Therefore, two selection devices are required, and the states are indicated by 300 and 301.

First, the channel # designated by the line designation signal 3001
Connection request signals 3010 and 303 from child station 1 and child station 3 respectively to one line
When 0 is transmitted, the connection request signal 3030 arrives at the master station with a delay of one frame with respect to the connection request signal 3010. Meanwhile, a line designation signal 3002 designating channel # 2 is transmitted in the next frame. At this time, the selection devices 300 and 301 are assigned to the respective channels # 1 and # 2. Selection device
Reference numeral 300 denotes that the connection request signal from the slave station 1 is selected from the connection request signals arriving during two frames (during the timer operation time T). Here, the line designation signal 3003 of the next frame is transmitted. The selection device 300 ends the selection for the channel # 1, and then waits for a connection request signal for the channel # 3 specified by the signal 3003. or,
The assignment of channel # 1 to slave station 1 is transmitted in the line designation signal 3004. The slave station 4 sends a connection request signal 3040 to the channel # 2 designated by the line designation signal 3002. The signal arriving on channel # 2 is a connection request signal 30
Since the number is only 40, the selecting device 301 notifies using the line designation signal 3005 that the slave station 4 is allocated to the channel # 2 after the time T. The slave station 3 notified of the non-selection by the signal 3004,
4 again sends a connection request signal 3031. During this time, there was no connection request for channel # 3. After T time, only the connection request signal 3031 has arrived on the channel # 4, so the selecting device 301 selects the slave station 3 and notifies it. In the line designation signal 3005, since there was no previous request for channel # 3, # 3 is designated again. Channel connection is performed by repeating this procedure.

〔The invention's effect〕

According to the present invention, each slave station is treated fairly despite the different propagation times to the master station, and the connection channels are sequentially assigned to the slave stations, so that the waiting time is reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of the principle of the present invention, FIG. 2 is a diagram showing a channel connection procedure of the configuration of FIG. 1, and FIG. 3 is a diagram showing a connection procedure of an embodiment of the present invention. FIG. 4 is a diagram showing a conventional channel connection procedure. 10 ... Line designation device 20 ... Timer device 30-32,301,302 ... Selection device 40 ... Valid line change device

Claims (1)

(57) [Claims] A line designation device for receiving a connection request signal from a plurality of slave stations at a master station and transmitting a line designation signal designating an available line in a wireless channel connection device for designating a line setting. A timer device for measuring a predetermined time for each of the line designation signals; and selecting any one of the connection request signals received by the master station within the predetermined time by the timer device. A plurality of selection devices that notify the selection to the plurality of slave stations, and an idle line change device that changes the available line to another idle line other than the one used by the selection device. A channel connection device characterized by the above-mentioned.